Stacey, do you believe this to be true?

What are OQ questions?

I assume you mean OG questions? My answer assumes you do.

Yes, IF you are studying the right way, you don't need to practice with anything other than OG questions to get a 700. (And, really, you need to be studying in the right way to get a 700 no matter what sources you're using!)

You may need some additional help around the answer explanations, though, as OG explanations often leave a lot to be desired. But the best questions (just pure questions) are OG questions.